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<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    
</body>
<script>
    // 检测昵称是否是有汉字字母数字下划线组成，6-8位
    const reg = /^[\w\u4e00-\u9fa5]{6,8}$/;;
    const nickName = "az1哈2哈_";
    const nickName2 = "az1";
    console.log(reg.test(nickName));
    console.log(reg.test(nickName2));
</script>
</html>